Tautulli URL not recognized as valid format

[kohbo]

Describe the bug

I'm trying to register the app with my self-hosted instance of Tautulli.

The URL in question is https://plex_stats.kohming.net

Steps to Reproduce

1. Generate a QR code through Tautulli using the "Register a New Device" option in the settings
2. Verify the URL matches publicly accessible URL for Tautulli
3. Click on Scan a QR code in the Tuatulli mobile app
4. Click "Register Device"
5. Notice the URL is not recognized as a valid format

Expected Behavior

Expect app to recognize the URL as valid

Tautulli Remote Version

v3.3.1(168)

Tautulli Version

v2.15.0

Mobile Device

Pixel Fold

Mobile OS

Android 18

Additional Context

No response

[kohbo]

I did some testing with alternate URLs. The issue is the underscore in the subdomain. A domain without an underscore causes no issue.

[TheMeanCanEHdian]

Unfortunately underscores are not valid characters for domain names as per RFC 1035 section 2.3.1.

Specifically:

They must start with a letter, end with a letter or digit, and have as interior
characters only letters, digits, and hyphen.

[TheMeanCanEHdian]

Alright so while this doesn't follow standards it is possible the validator I use can allow underscores. I will put this under investigation for now.

[codecrafting-io]

For me it does not accept hostname only on the URL, showing "Invalid URL format", like in https://hostname:port. The hostname in this case is just a name, no TLD. I can access the server through the browser just fine

[JonnyWong16]

That's already answered in #202.